package com.forezp.servicezuul;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;

/**
 * @version V1.0  </br>
 * @ClassName MyFilter </br>
 * @Description TODO  </br>
 * @Author tonywang</br>
 * @DATE 11/20/2018 10:28 AM</br>
 */
public class MyFilter extends ZuulFilter {
    private static Logger log = LoggerFactory.getLogger(MyFilter.class);

    //过滤的顺序
    @Override
    public int filterOrder() {
        return 0;
    }


    /*
        filterType：返回一个字符串代表过滤器的类型，在zuul中定义了四种不同生命周期的过滤器类型，具体如下：
        pre：路由之前
        routing：路由之时
        post： 路由之后
        error：发送错误调用
     **/
    @Override
    public String filterType() {
        return "pre";
    }
    //这里可以写逻辑判断，是否要过滤，本文true,永远过滤。
    @Override
    public boolean shouldFilter() {
        return true;
    }
    /**
     过滤器的具体逻辑。可用很复杂，包括查sql，nosql去判断该请求到底有没有权限访问。
     **/
    @Override
    public Object run() throws ZuulException {
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
        Object accessToken = request.getParameter("token");
        if(accessToken == null) {
            log.warn("token is empty");
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(401);
            try {
                ctx.getResponse().getWriter().write("token is empty");
            }catch (Exception e){}
            return null;
        }
        log.info("ok");
        return null;
    }
}
